Ключевые слова: academic, back, blackboard, board, business, businessman, chalkboard, cheerful, class, classroom, coach, coaching, course, discussing, education, educational, enjoying, explaining, green, happy, learn, learning, lecture, lecturer, lesson, man, meeting, mentor, mentoring, pointing, presentation, presenting, professional, school, seminar, showing, smiling, student, study, studying, suit, teacher, teaching, to, trainee, trainer, training, tutor, tutoring, university,